completing the square
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
A method of rewriting a quadratic expression so it contains a perfect square, used to solve equations or find a parabola's turning point.
Usage notes
It directly reveals a quadratic's turning point, without needing to graph it first.
Test yourself
Which word fits the gap? "_____ turned x squared plus six x into (x+3) squared minus nine."
Answer: completing the square
In your own words, what does "completing the square" mean?
A method of rewriting a quadratic expression so it contains a perfect square, used to solve equations or find a parabola's turning point.
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